Today I built a second agility obstacle for Flash, an adjustable jump bar. He's jumping over it pretty well. The top bar is at about 17" right now. It started at 20", which was a little too high for him to clear consistently (but with practice, I'm sure he'll jump much higher!). I need to start him out lower, and build him up. It doesn't take many jumps to wear him out right now.

The bar is made from 3/4" PVC, a handfull of Ts, and endcaps. The cups that hold the bars are cut from a T. First I cut the back off of the T, so the long edge will snap onto the pole. Then I cut the whole thing in half to make 2 cups. They snap onto the pole anywhere, so I can easily change the height of the bars. The two bars are wrapped with red electrical tape.